mx.trueband.net has no NS records.
NS records for this zone are defined at trueband.net.
NS records for this zone are defined at trueband.net.
Question and response
Question
dig mx.trueband.net. NS
Answer
The response has no answer records.
Authority
trueband.net. 300 SOA dns1.nrtc.net. root.dns1.nrtc.net. 2022091600 10800 3600 604800 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0